Importantly, this five-dimensional single copy which follows the Weyl doubling formula has arbitrary spins (as well as a possible nonzero NUT charge and cosmological constant), in contrast to the comment in [1]} that only the singly-rotating solution was possible. However, we do note that our zeroth-copy scalar only satisfies the flat-space Klein-Gordon equation (the aligned field itself satisfies both the curved and flat-space equations). Similarly, the obstruction we found to a higher-dimensional application of the Weyl doubling formula to our multi-Kerr-Schild single copy was in the inability to find the necessary scalar.
